code: def add_edge(self, src, dest, **props):
      self.add_node(dest)
      self._adjacency.setdefault(src, set()).add(dest)
      self._edges[(src, dest)] = props
  
file_path: catboost/contrib/python/pythran/pythran/graph.py
label_desc: Use image node_id 5 for calling the DiGraph obj's underlying member method code with example usage: obj.add_edge(src, dest) without return types